I have a Philips monitor that always worked, but two days ago it stopped working. I have tried plugging it in again, changing the sideos of the cable and it didn't work. Something interesting that I found is that when I pluged my pc in the tv that was in the other room it worked, so it's not the cable. But when Inswapped the tv and got my monitor next to the tv and plugged it in how I would at my desk, it worked. This is very weird and I can't explain it.